In the middle of the Obersauer Nature Park, the Circuit du Lac scores with a total of 44 kilometers of beautiful views and interesting insights into the unique animal and plant life around the Obersauer Reservoir. The Circuit du Lac is divided into two circular hiking routes.

This circular hiking route primarily focuses on the aspect of nature conservation and extensive use in the surroundings of "Misärshaff". The path leads through meadows and pastures that have been extensively used for several years to increase biodiversity. Here, nature conservation is implemented through extensive agricultural use. In this context, the northern slope above "Misärshaff" was transformed from a mineral-fertilized mown pasture to an area grazed extensively year-round. Within this framework, it is possible in the first third of the circular route to take a look into the shelter of a small Angus herd.

This circular route shows how the use of natural resources (water, wood, slate) has influenced the landscape and nature of the Upper Sauer over the past centuries. The aspect of nature conservation and extensive use is also explained. The circular route runs along the Sauer through forests and wet valley grounds, which form habitats for a diverse, partly rare, flora and fauna. With some luck, a few wild birds can be observed in their natural environment. Furthermore, the circular route offers some spectacular views.